Ohh good point, I forgot about that! That proc uses around 70-80watts (A bit under, shoot high and you won't miss ) of power, so you might be over the 150w mark when you get the rest in there.. And the full-sized HDD too uses more power, as does the video and RAM, both of which I think could be cut back, but your call

You mean OPUS's can't run at max spec? Or PSU's in general? If so, that explains my random PSU death - Running a duallie and 4 HDD's and 3 CD's and a lot of fans and 4 PCI's and a GeForce4Ti on a 350wPSU